Model year record

1977 MACK WS

8 recall campaigns on file for this model year. No owner complaints on file.

Recalls

Recall campaignNHTSA 79V137000

Steering: linkages

Component
Steering: linkages
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
6,673
Reported to NHTSA
1979-06-01
Owners notified
1979-10-22

Defect description

THE PITMAN ARM RETAINING NUT MAY NOT HAVE BEEN TORQUED TO MANUFACTURER SPECIFICATIONS. THIS COULD RESULT IN INADEQUATE RETENTION OF THE NUT AT THE OUTPUT SHAFT, ALLOWING THE PITMAN ARM TO BECOME LOOSE.

Manufacturer remedy

DEALER WILL INSPECT AND RETORQUE PITMAN ARM, IF NECESSARY, AT NO COST TO OWNER.

Recall campaignNHTSA 79V133000

Engine and engine cooling: engine

Component
Engine and engine cooling: engine
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
23,000
Reported to NHTSA
1979-05-31
Owners notified
1979-11-02

Defect description

IN THE EVENT OF TURBOCHARGER COMPRESSOR WHEEL FAILURE, ONE OR MORE OF THE FOUR CAPSCREWS THAT HOLD THE TURBOCHARGER TOGETHER MAY BE STRUCK BY PARTS OF THE COMPRESSOR WHEEL, RESULTING IN THE CAPSCREWS BEING DAMAGED. IF THESE CAPSCREWS ARE DAMAGED TO THE POINT THAT THEY ALLOW THE COMPRESSOR BACK PLATE TO DISLOCATE FROM THE TURBOCHARGER BEARING HOUSING, ENGINE LUBRICATING OIL MAY BE ALLOWED TO ESCAPE UNDER PRESSURE, CONTACTING THE ENGINE EXHAUST MANIFOLD SECTIONS OR TURBOCHARGER TURBINE HOUSING.

Manufacturer remedy

DEALER WILL INSTALL A SHIELD FOR THE HEADS OF THE FOUR CAPSCREWS, ALONG WITH STRONGER SAE 8 GRADE 8 CAPSCREWS, IF NECESSARY, AT NO COST TO OWNER.

Recall campaignNHTSA 78V210000

Service brakes, air: antilock: interconnecting assembly(wiring)

Component
Service brakes, air: antilock: interconnecting assembly(wiring)
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
19,370
Reported to NHTSA
1978-10-03
Owners notified
1978-11-07

Defect description

DELAYS OF UP TO ABOUT 2 SECONDS MAY EXIST IN THE BRAKE APPLICATION TIMES TO THE BRAKES ON THE BOGIE AXLES IN THE PRESENCE OF CERTAIN TYPES OF WHEEL SPEED SENSOR SIGNAL DISCONTINUITIES OR DISTORTIONS THAT MAY OCCUR AS A RESULT OF SENSOR WIRE FAILURE. THIS CONSTITUTES A NON-COMPLIANCE TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS".

Manufacturer remedy

DEALER WILL INSTALL NEW WHEEL SPEED SENSORS THAT INCORPORATE IMPROVED WIRING AND THE PRESENT BOGIE ANTI-WHEEL LOCK SYSTEM WILL BE CHANGED TO AN AXLE-TO-AXLE SYSTEM FOR IMPROVED RELIABILITY.

Recall campaignNHTSA 78V170000

Engine and engine cooling: engine

Component
Engine and engine cooling: engine
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
850
Reported to NHTSA
1978-08-08
Owners notified
1978-12-04

Defect description

THE POSSIBILITY EXISTS THAT THE ALUMINUM ENGINE REAR SUPPORT BRACKETS MAY FAIL DUE TO METAL FATIGUE. THIS TYPE OF FAILURE WOULD ALLOW THE ENGINE AND TRANSMISSION ASSEMBLY TO DISLOCATE DOWNWARD. THIS WILL RESULT IN THROTTLE CONTROL LOSS WITH THE ENGINE OPERATING CONTINUOUSLY IN THE MID TO UPPER RANGE OF THE GOVERNED SPEED RANGE.

Manufacturer remedy

DEALER WILL INSPECT AND, IF NECESSARY, REPLACE ALUMINUM SUPPORT BRACKETS WITH BRACKETS MADE FROM DUCTILE IRON FOR INCREASED STRENGTH.

Recall campaignNHTSA 78V030000

Service brakes, air: supply: hoses, lines/piping, and fittings

Component
Service brakes, air: supply: hoses, lines/piping, and fittings
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
400
Reported to NHTSA
1978-02-09
Owners notified
1978-08-23

Defect description

A DESIGN DEFICIENCY EXISTS IN THE AIR DRYER PIPING IN THE AREA OF THE PRESSURE RELIEF VALVE AND COMPRESSOR GOVERNOR CONTROL LINK. MOISTURE IS PASSED AND BUILDS UP IN THIS RELIEF VALVE AND CONTROL LINE. IN FREEZING AMBIENT TEMPERATURES, THIS MOISTURE MAY FREEZE, ALLOWING THE CHASSIS AIR SYSTEM PRESSURE TO EXCEED 150 PSI. EXCESSIVE AIR SYSTEM PRESSURE CAN CAUSE SEPARATION OF AIR PIPING CONNECTIONS AND AIR SYSTEM VALVE FAILURE.

Manufacturer remedy

THE DEALER WILL RELOCATE THE AIR SYSTEM COMPRESSOR GOVERNOR LINE AND PRESSURE RELIEF VALVE TO ELIMINATE MOISTURE ACCUMULATION.

Recall campaignNHTSA 77V205000

Suspension: rear: springs: leaf spring assembly: hanger/bracket

Component
Suspension: rear: springs: leaf spring assembly: hanger/bracket
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
7,400
Reported to NHTSA
1977-11-21
Owners notified
1978-03-14

Defect description

A DEFICIENCY EXISTS IN THE WELDS SECURING THE REAR SPRING INSULATOR BRACKET TO THE AXLE HOUSING. THIS IS DUE TO IMPROPER POSITIONING OF THE WELD, IN RELATIONSHIP TO THE BRACKET AND AXLE HOUSING. FAILURE OF THE WELDS WOULD CAUSE SEPARATION OF THE SPRING INSULATOR BRACKET AND THE AXLE HOUSING, RESULTING IN IMPROPER ALIGNMENT OF THE AFFECTED AXLE.

Manufacturer remedy

DEALER WILL REWELD THE INSULATOR SPRING BRACKET AT NO COST TO OWNER.

Recall campaignNHTSA 77V173000

Engine and engine cooling: cooling system: fan

Component
Engine and engine cooling: cooling system: fan
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
48,000
Reported to NHTSA
1977-10-12
Owners notified
1978-03-23

Defect description

THE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.

Manufacturer remedy

DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.

Recall campaignNHTSA 77V149000

Wheels: multi piece

Component
Wheels: multi piece
Manufacturer
MACK TRUCKS, INCORPORATED
Vehicles affected
250
Reported to NHTSA
1977-09-19
Owners notified
1978-01-17

Defect description

THE FRONT WHEEL ALUMINUM HUBS ON THE INVOLVED VEHICLES MAY BE SUBJECT TO CRACKS WHICH MAY PROGRESS CIRCUMFERENTIALLY AROUND THE BARREL OF THE HUB. THIS COULD LEAD TO A FRACTURE IN THE "BARREL" POSITION OF THE HUB AND COMPLETE HUB FAILURE.

Manufacturer remedy

DEALER WILL INSTALL STEEL HUBS IN PLACE OF ALUMINUM HUBS WITHOUT CHARGE TO OWNER.

Owner complaints

A complaint is one person's report to a federal agency. It is not a finding.

No complaints recorded for this model year.

Safety recall repairs are provided free of charge by franchised dealers, regardless of vehicle age or mileage. This page displays aggregated data for the model year. To check recall status for a specific vehicle, search its VIN at nhtsa.gov.